SceExfatfs

SceExfatfs handles FAT12/UVFAT12/FAT16/FAT32/exFAT file system parsing.

It also works as a transaction safe if the file system has two FATs (TFAT32, TexFAT).

Module

Version	World	Privilege
1.69-3.73	Non-secure	Kernel

Libraries

Known NIDs

Version	Name	World	Visibility	NID

Data segment layout

Address	Size	Description
0x0000	4	mutex to lock mempool
0x0004	4	SceUID mempool SceExfatfsCommon of size 0x7F000
0x0008	4	unknown
0x000C	0x20	vfs_add_data exfat node
0x002C	4	unknown
0x0030	4 * 8(0x20)	Partition drive strings pointers. os0: etc.
0x0050	0x10	unknown
0x0060	4	SceFatfsCPTable memblock base.
0x0064	4	SceFatfsCPTable memblock guid.
0x0068	0x10	array of void* pointers (pools)
0x0078	4	some counter.
0x007C	4	unused in order to next member align.
0x0080	0x430 * 15(0x3ED0)	15 elements of type exfat_ctx
0x3F50	0x200 * 15(0x1E00)	Storage MBR
0x5D50	4	pointer
0x5D54	4	unknown
0x5D58	0x290*0x400(0xA4000)	0x400 elements of type file_entry
0xA9D58	0x290*0xC00(0x1EC000)	0xC00 elements of type file_entry. maybe related to ReserveUnusedFd.
0x295D58	0x78	unknown
0x295DD0	4	All file_entry elements number?
0x295DD4	4	Available SceExfatfs_data_0x5D50 elements number
0x295DD8	4	Related to ReserveUnusedFd number of SceExfatfs_data_0x5D50 elements. 0x200 in many case.
0x295DDC	4	Related to ReserveUnusedFd number of SceExfatfs_data_0x5D50 elements. 0x100 in many case.
0x295DE0	4	unknown
0x295DE4	4	SceExfatfsSharedResource fast mutex
0x295DE8	0x40	unknown

Types

#define SCE_EXFATFS_DEVCTL_CREATT_WDIR (2)

typedef struct exfat_ctx //size is 0x430 bytes
{
  uint32_t unk_0;
  uint32_t unk_4;
  uint32_t unk_8;
  uint32_t unk_C;

  uint32_t unk_10;
  uint32_t unk_14;
  file_entry* unk_18;
  uint32_t unk_1C;

  uint32_t unk_20;
  uint32_t unk_24;
  uint32_t unk_28;
  uint32_t unk_2C;

  char data1[0x3B0];

  uint32_t fast_mutex_SceExfatfsRoot; //offset 0x3E0

  char data2[0x4C];

} exfat_ctx;

typedef struct file_entry //size is 0x290 bytes
{
  uint32_t unk_0;
  uint32_t unk_4;

  char path[0x208]; //in unicode

  char data1[0x80];
}file_entry;